John m



( 0 Model.) V

J. M. CORNELL.

EXPANDING BOLT. No. 282,501. I Patented Aug. 7, 1883.

Q h v UNITED STATES PATENT @FFICE.

JOHN M. CORNELL, on NEW Yonx, N. Y.

EXPANDING BOLT.

SPECIFIGATION forming part of Letters Patent No. 282,50l, dated August 7, 1883. Application filed April 21, 1883. (in. model.)

Z) (LZZ whom, it may concern:

Be it known that I, JOHN M. CRNELL, a

citizen of the United States, residing at New Fig. 2 is an elevation of one part of the same York, in the State of New York, have invented a new and useful Improvement in Expanding Bolts, of which the following is a specification. This invention relates to improvements in the construction of expanding bolts foruse in attaching iron to stone or brick work in architectural and like structures.

The objects of the present invention are, first, to adapt a simple longitudinally-divided bolt shell or nut to be expanded by an ordinary screw-bolt as the bolt proper, and at the same time to afford the latter ample independent movement for tightly clamping attached iron-work of different thicknesses without the aid of the additional parts commonly used; and, secondly, to prevent a bolt shell or nut so expanded from collapsing under strain.

A sheet of drawings accompanies this specification as part thereof. i

s Figure 1 of these drawings isanend view of the bolt shell or nut of my 0 qandingbolt.

with the screw-bolt in position to enter. Fig. 3 is an edge view of the unexpanded bolt shell or nut. Fig.4 is alike view of the expanding bolt complete, with the bolt shell or nut expanded and the screw-bolt in different positions. Fig. 5 is an end'view of the expandingbolt as seen in Fig. ,4, and Fig. 6 is a longitudinal section on the line 6 6, Fig. 5,. showing the same as in use.

3 5 Likeletters of referenceindicate correspondwhich the said bolt shell or nut is fitted.

parts A B are identical with each other in size and general form, and may,'in the rough, be castings in iron or brass from one and the same pattern. Each of these parts is a longitudinal section of a hollow cylinder, and they form together, when the nut is not expanded, a

somewhat flattened cylinder, as represented by Figs. 1 and 3. This adapts the nut to enter freely an inwardly-flaring socket, S, Fig.

. 6, cut to fit it in its expanded form,.and to expand therein without binding. Interhally the nut has at its outer end a short inwardlytapering screw-tapped expanding section, at, formed by clamping the parts A B solidly in the positions which they are to assume when expanded, as seen .in Figs. 4., 5, and 6, and reaming out and tapping said expanding section to fit the SOlGAV-bOll] C. As the screwbolt is subsequently screwed into the nut when the latter is within the said socket S, the said nut is expanded to said final shape, and when the screw-bolt has reached the inner limit of said expanding section :17, as shown in full lines in Fig. 4, the expansion is complete. The screw-bolt may now be screwed in to the limit of its thread, if required, as shown in dotted lines in Fig. 4, with out danger of bursting the nut or socket, on it may be screwed in to any less extent (being in all cases adapted to extend within said expanding section) without impairing the security of the fastening. Different thicknesses of iron-work, I, Fig. 6, may consequently be tightly attached with equal facility by one and the same size of expanding bolt, while variations in the sockets S are compensated for by the same aneans. Longer or shorter screw-bolts may of course be used, as occasion may require, and the relative length of the expanding section may vary in nuts of a given length. Beyond each expanding section as, each of the parts A B is provided with a longitudinal supporting-incline, y, located centrally within its longitudinal recess, and consequently in the plane of expanslon. expanding operation; but, as clearly seen in Fig. 6, resting upon the thread of the screwbolt 0, they'aiford solid support to all that portion of each part of the nut beyond said expanding section 00, and tend to preclude collapsing. inclines may be formed or trued by reaming out the inner end of the expanded nut, while it is clamped for reaming out and tapping its outer end, as aforesaid.

To provide in a simple and effective way for keeping the parts A B of each nut together prior to their use, for aligning the segmental threads-in the expanding section a: for the reception of the screw-bolt O, and for preventing displacement of either part while loose These inclines have no function in the I The effective inner surfaces of said provided near the outer end of the nut, and Within this a circumferential Wire, 10, is tied, the inner surfaces of the respective parts A B beingbeveled at their outer extremities, as

represented at ab, to accommodate them to this location of the centers of movement.

A suitable hinge may be otherwise formed in any ap proved Way. 1

Having thus set forth my said invention, I claim as ne 1. An expanding bolt composed of a longitudinally-divided bolt shell or nut and an ordinary screw-bolt, the former provided with a short internally screw-tapped expanding section, in penetrating which the said bolt shell or nut is fully expanded by said screwbolt, substantially as herein specified.

JOHN m-connnnn Witnesses:

O. TUNIS, H. W. REDFIELD. 

